Extraction apparatus



June 9, 1942. M. J. KAHAN EXTRACTION APPARATUS Filed April 21. 1939 INV NTOR. Ma/f/mer .fa/mn ATTORNEY placed thereon.

'complished at atmospheric temperature Patented June 9, 1942 EXTRACTION APPARATUS Mortimer J. Kahan, New York, N.'Y., aaaig nor, by direct and mesne assignments, to Earl Meyer,

New York, N. Y.

Application April :1, 1939, Serial Nb. 269,090

1 Claim.

The purpose of this invention is to provide an improved method and device for extracting a coffee or other concentrate in which extraction is obtained without heat and at atmospheric temperature.

The invention is in the use of a container having granulated coffee or other material occupyinga major portion thereof, with a compressed air chamber at the lower end and an area to be filled with water at the upper end and positioned. above the material so that the weight of the water is on the material: wherein the water penetrates quickly downward through the ma-.

terial forcing the air downward from within and around the particles of material. A vent 'tube releases any excess air in the air chamber. This passes through the mass enter the air chamber.

The water, which penetrates quickly downward through the material because of the vent through the air chamber, moves through; and across a perforated plate, separating the material from the compressed air chamber, and then upward through a vent tube in the center of the material. When the water reaches the base of .the tube, the coflee mass is completely saturated.

The top plate, which is positioned upon the material and which has perforations therein, may be adjusted to diflerent levels, and is ad-. dusted to a. certain level depending upon the quantity of material placed in the apparatus, and, when in place, a screw clamp or ring with thumb screws is moved into position above the perforated plate and secured in place. This holds the material in place and prevents the material from rising and mixing when liquid is provide an improved method of making a coffee or other concentrate without the use of heat.

Another object is to provide an apparatus for producing a coffee or other concentrate in which the air is forced out of the granular particles, by the weight of the water superimposed thereon, downward to the air chamber and the excess Elie escapes upward and out through the vent tu I Another object is to provide an apparatus for obtaining a coffee or other concentrate in which the bitter oils and other by-products remain in the material and are not combined in the concentrate. I c

A further object is to provide an apparatus for obtaining a concentrate from granulated material, in which extraction is obtained through the material by a water chamber at the upper end and a vertical tube through the material :and communicating with the air chamber which paratus for obtaining concentrates of coffee and other materials by a process which is of a simple and economical construction. I,

With these ends inview the invention embodies an apparatus comprising a container with a draw-off cock at the lower end, and an air chamber communicating with the cock, and a removable cover having vents therein, a perforated plate covered by a strainer at thelower end and having a spout extending upwardv through the center of the container which acts as an air vent, a seal, and a flow vent, in the order named, and another perforated disc havlng holding means thereon adapted to be pod- Many attempts have been made to obtain a tioned, ontop of material in the container.

Other features and advantages of the invention will appear from the following description taken in connection with the drawing, wherein:

. Figure 1 is a view-showing across section throughthe apparatus. Figure 2 is a sectional plan through the upper portion of the app ratus on linei-l of 1'18- ure 1, showing the showing an alternate method of securing the disc to the tube.

forated plate.

In the drawing the device is shown as it may be made, wherein numeral l indicates them- The object 0! this invention is, therefore, to tainer of the apparatus, numeral 2, the lower per perforated disc and Figure 3 is a detail showing the lower perperforated plate, and numeral 3, the'upper per iorated plate.

The container is illustrated as being of a cylindrical shape, however it will be understood that it may be of any shape and may be of any length or size.

This container is formed with an-air chamber 6 at the lowerend having a drain or draw-off cock. 5 therein, and the plate 2 rests upon a continuous shoulder ii at the intersection of the air chamber 3 and the body of the container.

The plate 2 is covered with a strainer l of cloth or any suitable material, and this is positioned on the under side of the plate with the edges rolled over and bound on the upper side of the plate, as indicated at the point 5. The central part of the plate 2 curves upward, as illustrated at the point t, and opens into a tube it that extends upward to a point i i which is slightly above the upper end of the container i, and, therefore, above the levei of a fluid that may be placed in the container.

The disc 3 is mounted upon the tube it, and,

after the apparatus is filled with ground cofiee or other material, the disc is moved downward against the upper surface of the'material and clamped in place by a thumb screw it in a ring it, in the design shown in Figure 1, however,

' it may also be held by a clamp id, as illustrated in Figure 2, or any suitable means may be used for securing the disc 3 to the tube it, to prevent its being forced upward by izhe pressure caused by the expansion of material confined in the container and held'between the'plate and disc. The disc may also be provided with handles it and it by which it may be removed and re-.

placed. The upper end of the apparatus is provided with a cover it having a vent it in the top of the center, and it may also be provided with additional vents iii and it at the sides, al

though it will be understood that only one or any number of vents may be used,

It will be understood that changes may be' made in the construction of the apparatus with= out departing from the spirit of the invention. One of which changes may be in the shape, de-

' sign, or size of the air compartment at the lower end, another may be in the type or design or chances in use the apparatus will he filled with ground or pulverized coffee or other material with the plate 2 in place, and the coffee or other material will occupy a substantial area of the containe'r, providinga relatively iarge area for we ter at the upper end, and then the disc 3 is placed on the material and forced downward and secured in place. Water is then supplied to the upper end of the container, and the weight of the water resting upon the material will force the water downward, and this will force air out of the small spaces around the particles and also out of the particles, and then air will be crowded downward, with the air first'escaping through the vent tube it until water passing downward reaches the lower end of the mass of material passing all of the way through the material and through the perforations in the plate 2, and the water will then pass along the under surface of the plate to the tube iii, and then upward through the tube, seeking the level of the water in the container. The water does not pass through the strainer l but clings to the under surface of the plate and moves toward the tube where it passes upward, and when the tube is filled with water it stops the air, causing the air to be compressed in the chamber in the lower end.

When the apparatus is ready to be drained after the material has been extracting in the process for a certain length of time, the drain cock at the bottom of the air chamber is opened,

and the vent tube reverses its action, and the water in the tube, which has become a concentrate during the process of extraction, drains rapidly downward and out of the drain cock ahead oi the liquid within the codes mass.

Having thus fully described the invention,

what I claim as new, and desire to secure by Letters Patent, is:

An extraction apparatus comprising a vertical cylindrical container having a circular depression in the bottom thereof surrounded by an an- MQRTIMER J. KAHAN. 

